Recap
In Brookline, Massachusetts, friends and family arrive for the wedding of David Staller and Shelley Milton. David, an asthmatic, is nervously having a drink with his friends in one office of the reception hall. David's mother checks on Shelley and welcomes her to the family...
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Episode Quotes
Walter: I kept my tuxedo in the hope that one day I would have a son who would wear it. You could wear it on your wedding day.
Peter: Yeah, you know, Walter? Tuxedo styles change.
Walter: Oh, nonsense. Purple never goes out of style.
Olivia: So he programmed the toxin to target whatever group he wants.
Walter: Any group with--with common physical characteristics or genetic similarities, yes. Um, tall people, short people, fat people, skinny people, black people, brown people, or white people...
Peter: Hey, Walter? We get it.
Episode Goofs
Although the toxin targets Walter based on his DNA, it doesn't affect Peter. This is understandable, given the character's hidden background. However, Olivia wouldn't know. And yet she never finds it unusual that Peter is immune to a poison tailored to Bishop DNA.
Analysis
Hoffman uses hair samples from Walter's sweater to tailor his toxin to Walter's genetic characteristics. However, the toxin does not affect Peter. At first, this appears to be an error. However, upon further consideration, Peter's immunity is due to the fact that because he is from the alternate Earth, he is not an exact genetic match for this world's Walter.